fix(worker): gracefully handle 'off' value for max_report_age

[sentry]

This PR addresses the TimestringInvalid error that occurs when codecov.max_report_age is set to the string "off" in a user's YAML configuration.

Previously, the from_xml functions in cobertura.py, clover.py, and jacoco.py would attempt to parse the "off" string as a date because it is a truthy value. This led to a TimestringInvalid exception.

The fix introduces an additional check in the if condition that determines whether to perform the report age validation. Specifically, and str(max_age).lower() != "off" has been added. This ensures that if max_report_age is explicitly set to "off", the entire date comparison block is skipped, preventing the invalid parsing attempt and allowing users to effectively disable the report age check as intended.

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Fixes WORKER-YX4

[codecov-notifications]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ All tests successful. No failed tests found.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.83%. Comparing base (d8942db) to head (0523803).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1885   +/-   ##
=======================================
  Coverage   91.83%   91.83%           
=======================================
  Files        1332     1332           
  Lines       51830    51830           
  Branches     1647     1647           
=======================================
  Hits        47598    47598           
  Misses       3911     3911           
  Partials      321      321           

Flag	Coverage Δ
workerintegration	58.51% <33.33%> (ø)
workerunit	90.39% <100.00%> (ø)

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